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docs(install_deps): clarify _apt_candidate_version SIGPIPE comment

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boypt
2026-09-15 18:24:54 +08:00
parent 392a4da986
commit 3d96f9f4ae
1 changed files with 9 additions and 7 deletions
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16
install_deps.sh
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@@ -20,13 +20,15 @@ export DEBIAN_FRONTEND=noninteractive
# ---------------------------------------------------------------------------
# _apt_candidate_version: get a package's candidate version string, or ""
#
# Deliberately does NOT use `awk '{print; exit}'` / `head -n1` to short-
# circuit the pipe. Under `set -o pipefail`, closing the read end early
# causes the upstream command (apt-cache policy) to receive SIGPIPE on its
# next write and exit 141; pipefail then reports 141 for the whole pipeline
# even though the value was captured correctly, which trips `errexit` via
# the ERR trap. Letting awk consume the full (small) stream avoids that
# failure mode entirely rather than papering over it with `|| true`.
# Deliberately does NOT use `awk '/Candidate:/{print $2; exit}'` / `head -n1`
# to short-circuit the pipe. The Candidate line appears early in
# `apt-cache policy` output with the Version table still to follow;
# closing the read end early lets apt-cache hit SIGPIPE on its next
# write and exit 141; under `set -o pipefail` that 141 becomes the
# pipeline status even though the value was captured, tripping
# `errexit` via the ERR trap. Letting awk consume the full (small)
# stream avoids that race entirely rather than papering over it with
# `|| true`.
# ---------------------------------------------------------------------------
_apt_candidate_version() {
local pkg="$1"